A One-Sided Tetromino

One-Sided Tetromino

A One-Sided Tetromino

A One-Sided Tetromino

One-Sided Tetromino

A One-Sided Tetromino

A poster of seven One-Sided Tetrominoes

One-Sided Tetrominoes Poster

A poster of seven One-Sided Tetrominoes

A One-Sided Tromino

One-Sided Tromino

A One-Sided Tromino

A One-Sided Tromino

One-Sided Tromino

A One-Sided Tromino

A poster of both Trominoes

Trominoes Poster

A poster of both Trominoes

Obtuse triangle with altitude drawn.

Obtuse Triangle

Obtuse triangle with altitude drawn.

Obtuse triangle with altitude and one median drawn.

Obtuse Triangle

Obtuse triangle with altitude and one median drawn.

Quadrilateral with intersecting diagonals and segment connecting midpoints.

Quadrilateral With Diagonals and Midpoints Joined

Quadrilateral with intersecting diagonals and segment connecting midpoints.

A flashcard featuring an illustration of a Polygon with ten equal sides

Flashcard of a Polygon with ten equal sides

A flashcard featuring an illustration of a Polygon with ten equal sides

A flashcard featuring an illustration of a polygon with twelve equal sides

Flashcard of a polygon with twelve equal sides

A flashcard featuring an illustration of a polygon with twelve equal sides

A flashcard featuring an illustration of a polygon with nine equal sides

Flashcard of a polygon with nine equal sides

A flashcard featuring an illustration of a polygon with nine equal sides

A flashcard featuring an illustration of a polygon with three equal sides

Flashcard of a polygon with three equal sides

A flashcard featuring an illustration of a polygon with three equal sides

A flashcard featuring an illustration of a polygon with eleven equal sides

Flashcard of a polygon with eleven equal sides

A flashcard featuring an illustration of a polygon with eleven equal sides

A flashcard featuring an illustration of a polygon with seven equal sides

Flashcard of a polygon with seven equal sides

A flashcard featuring an illustration of a polygon with seven equal sides

A flashcard featuring an illustration of a polygon with six equal sides

Flashcard of a polygon with six equal sides

A flashcard featuring an illustration of a polygon with six equal sides

A flashcard featuring an illustration of a polygon with eight equal sides

Flashcard of a polygon with eight equal sides

A flashcard featuring an illustration of a polygon with eight equal sides

A flashcard featuring an illustration of a Parallelogram

Flashcard of a Parallelogram

A flashcard featuring an illustration of a Parallelogram

A flashcard featuring an illustration of a polygon with five equal sides

Flashcard of a polygon with five equal sides

A flashcard featuring an illustration of a polygon with five equal sides

A flashcard featuring an illustration of a polygon with four unequal sides

Flashcard of a polygon with four unequal sides

A flashcard featuring an illustration of a polygon with four unequal sides

A flashcard featuring an illustration of a Rectangle

Flashcard of a Rectangle

A flashcard featuring an illustration of a Rectangle

A flashcard featuring an illustration of a Rhombus

Flashcard of a Rhombus

A flashcard featuring an illustration of a Rhombus

A flashcard featuring an illustration of a polygon with four equal sides

Flashcard of a polygon with four equal sides

A flashcard featuring an illustration of a polygon with four equal sides

A flashcard featuring an illustration of a polygon with four equal sides

Flashcard of a polygon with four equal sides

A flashcard featuring an illustration of a polygon with four equal sides

A flashcard featuring an illustration of a Trapezoid

Flashcard of a Trapezoid

A flashcard featuring an illustration of a Trapezoid

Illustration of an irregular polygon/heptagon/septagon.

Irregular heptagon

Illustration of an irregular polygon/heptagon/septagon.

Illustration of a how to construct a pentagon similar to two given pentagons.

Pentagon Constructed to be Similar to Given Pentagons

Illustration of a how to construct a pentagon similar to two given pentagons.

Illustration of a how to construct a triangle equivalent to a given hexagon/polygon.

Hexagon Used to Construct Equivalent Triangle

Illustration of a how to construct a triangle equivalent to a given hexagon/polygon.

Illustration of a how to construct a square equivalent to a given parallelogram.

Parallelogram Used to Construct Equivalent Square

Illustration of a how to construct a square equivalent to a given parallelogram.

Regular nonagon inscribed in a circle.

Nonagon Inscribed in a Circle

Regular nonagon inscribed in a circle.

Regular pentagon inscribed in a circle, circumscribed about a circle.

Pentagon Inscribed & Circumscribed in Circles

Regular pentagon inscribed in a circle, circumscribed about a circle.

Illustration of the sections of a prism made by parallel planes cutting all the lateral edges into equal polygons.

Sections of Prism

Illustration of the sections of a prism made by parallel planes cutting all the lateral edges into equal…

Illustration of the sections of a prism made by parallel planes cutting all the lateral edges into equal polygons.

Sections of Prism

Illustration of the sections of a prism made by parallel planes cutting all the lateral edges into equal…

Illustration showing two prisms are equal if the three faces which include a trihedral angle of the one are respectively equal to three faces which include a trihedral angle of the other, and are similarly placed.

Equal Prisms

Illustration showing two prisms are equal if the three faces which include a trihedral angle of the…

Illustration of a pyramid and with a regular polygon inscribed in and circumscribed about a cone. "If a pyramid whose base is a regular polygon is inscribed in or circumscribed about a circular cone, and if the number of sides of the base of the pyramid is indefinitely increased, the volume of the cone is the limit of the volume of the pyramid, and the lateral area of the cone is the limit of the lateral area of the pyramid."

Cone With Regular Polygon Inscribed and Circumscribed About

Illustration of a pyramid and with a regular polygon inscribed in and circumscribed about a cone. "If…

Illustration of a cone of revolution used to show that the lateral area is equal to half the product of the slant height by the circumference of the base.

Lateral Area of Cone of Revolution

Illustration of a cone of revolution used to show that the lateral area is equal to half the product…

Illustration of a cone with a polygon inscribed used to show that the volume of a circular cone is equal to one third the product of its base by its altitude.

Volume of Cone

Illustration of a cone with a polygon inscribed used to show that the volume of a circular cone is equal…

Illustration of a sphere with a polyhedral angle whose vertex is at the center of the sphere and whose face angles are measured by the sides of the polygon, whose dihedral angles have the same numerical measure as the angles of the polygon.

Polyhedral Angle in a Sphere

Illustration of a sphere with a polyhedral angle whose vertex is at the center of the sphere and whose…

Illustration of a spherical polygon.

Spherical Polygon

Illustration of a spherical polygon.

Illustration of a spherical polygon.

Spherical Polygon

Illustration of a spherical polygon.

Illustration of a hexagon with 60 ° angles and sides of 8".

Hexagon

Illustration of a hexagon with 60 ° angles and sides of 8".

3/3 of a 3 sided polygon with one piece detached

Fractions of 3-sided Polygon

3/3 of a 3 sided polygon with one piece detached

4/4 of a 4 sided polygon with one piece detached

Fractions of 4-sided Polygon

4/4 of a 4 sided polygon with one piece detached

6/6 of a 6 sided polygon with one piece detached

Fractions of 6-sided Polygon

6/6 of a 6 sided polygon with one piece detached

7/7 of a 7 sided polygon with one piece detached

Fractions of 7-sided Polygon

7/7 of a 7 sided polygon with one piece detached

8/8 of a 8 sided polygon with one piece detached

Fractions of 8-sided Polygon

8/8 of a 8 sided polygon with one piece detached

9/9 of a 9 sided polygon with one piece detached

Fractions of 9-sided Polygon

9/9 of a 9 sided polygon with one piece detached

10/10 of a 10 sided polygon with one piece detached

Fractions of 10-sided Polygon

10/10 of a 10 sided polygon with one piece detached

11/11 of a 11 sided polygon with one piece detached

Fractions of 11-sided Polygon

11/11 of a 11 sided polygon with one piece detached

12/12 of a 12 sided polygon with one piece detached

Fractions of 12-sided Polygon

12/12 of a 12 sided polygon with one piece detached

Illustration of an irregular convex hexagon.

Irregular Convex Hexagon

Illustration of an irregular convex hexagon.

Illustration of an irregular hexagon. This is also an example of a concave polygon.

Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon.

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Illustration of an irregular convex hexagon with symmetry.

Irregular Convex Hexagon

Illustration of an irregular convex hexagon with symmetry.

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Irregular Concave Hexagon

Illustration of an irregular hexagon. This is also an example of a concave polygon with symmetry.

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Crossed Polygon

Illustration of crossed polygon. This is not generally considered to be a real polygon.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

Irregular Concave Pentagon

Illustration of an irregular pentagon. This is also an example of a concave polygon with symmetry.

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.

Irregular Convex Pentagon

Illustration of an irregular pentagon. This is also an example of a convex polygon with symmetry.